Kenwood DP-1100 B Service Manual page 140

D P - 1 1 0 0 B II
5-2 MECHANISMS AND THEIR OPERATIONS
5-2-1 Pickup slide m e c h a n i s m
(1) Operation ( S e e Fig. M 1 . )
Explanation is given o n l y f o r f o r w a r d m o d e (during play
or w h e n t h e p i c k u p is fast f o r w a r d e d ) . T h e d i r e c t i o n of
e a c h a r r o w used is reverse in reverse m o d e .
a) W h e n carry m o t o r (26) rotates, the plastic w o r m gear
of m o t o r t u r n s in t h e d i r e c t i o n of the a r r o w .
b) Gear W H ( 2 1 ) is driven by e n g a g e m e n t w i t h
w o r m gear.
c) Gear W H (21) has t h e drive shaft j o i n t e d by D-shape
e n g a g e m e n t . W o r m T a t t a c h e d t o the drive shaft also
t u r n s in the d i r e c t i o n of the a r r o w t o g e t h e r w i t h gear
W H ( 2 1 ) .
d) T h e g u i d e rack m o v e s by e n g a g e m e n t w i t h w o r m T.
e) Pickup a d j u s t m e n t
( 3 8 ) s e c u r e d to t h e guide rack p e r f o r m linear m o v e ­
m e n t in t h e d i r e c t i o n of a r r o w ( A ) .
(2) C o n s t r u c t i o n
a) T h e drive shaft, w o r m T a n d the g u i d e rack, w h i c h are
u n i f i e d , are service parts as gear a s s ' y ( 1 9 ) . W o r m T
is a t t a c h e d w i t h adhesive t o the p r e d e t e r m i n e d posi­
t i o n .
b) T h e carry m o t o r a n d the plastic w o r m gear, w h i c h are
unified by f o r c e f i t t i n g , are service parts as m o t o r
a s s ' y ( 2 6 ) .
c) M o t o r shaft t h r u s t s p r i n g (25) a n d drive shaft thrust
s p r i n g ( 2 4 ) exert f o r c e o n the m o t o r shaft a n d the
drive shaft in the d i r e c t i o n of t h r u s t to eliminate the
servo lag t i m e d u e t o i n c o n s t a n t t h r u s t w h e n
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5. MECHANISM OPERATION
Hexagon socket setscrew B 2 . 6 x 8 (62)
Laser pickup (38)'
Disc motor ass'y (10)-
Pickup carry motor (26)
Drive shaft thrust spring (24)
Fig. M1 L a s e r pickup slide m e c h a n i s m
m o u n t ( 8 1 7 ) a n d laser p i c k u p
Pickup adjustment mount (817)
, Special screw 3 x 1 0 (64)
Hexagon socket setscrew A 2 . 6 x 8 (62)
, Guide rack spring (20)
Worm T
Guide rack
- Motor mount (23)
Motor shaft thrust spring (25)
Gear WH (21)
p i c k u p is d r i v e n . The f u n c t i o n of these springs m a k e s
i n c o n s t a n t t h r u s t a d j u s t m e n t u n n e c e s s a r y ,
d) F u n c t i o n of g u i d e rack spring (See Fig. M 2 . )
T h e g u i d e rack spring enables the p i c k u p t o be driven
by t h e w o r m T a n d the teeth of the guide rack w h e n
the the unit ( m e c h a n i s m ) n o t p l a c e d level. N o r m a l l y , w i t h
the unit ( m e c h a n i s m ) p l a c e d level, a gap exists bet­
w e e n t h e g u i d e rack a n d the guide rack s p r i n g . W h e n
n o t p l a c e d level, the spring applies e n o u g h f o r c e to
the g u i d e rack so t h a t the e n g a g e m e n t of w o r m T a n d
the g u i d e rack is the s a m e as w h e n p l a c e d level.
Pickup adjustment mount (817)
Laser pickup
the
Fig. M 2 F u n c t i o n of guide rack spring
Thrust bearing (17)
Rack gear ass'y (19)
Guide rack spring
Guide rack
- Drive shaft
Worm T
Normally, a clearance is present.